Abstract
Plantago species differ in their strategy towards salt stress, a major difference being the uptake and distribution of Na+ ions. A salt‐sensitive (Plantago media L.) and a salt‐tolerant (P. maritima L.) species were compared with respect to Na+/H+ antiport activities at the tonoplast. After exposure of the plants to 50 mM NaCl for 6 days isolated tonoplast vesicles of P. maritima showed Na+/H+ antiport activity with saturation kinetics and a Km of 2.4 mM Na+, NaCl‐grown P. media and the control plants of both species showed no antiport activity. Selectivity of the antiport system for Na+ was high and was determined by adding different chloride salts after formation of a Δ pH in the vesicles. Specific tonoplast ATPase activities were similar in the two species and did not alter after exposure to NaCl stress.
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